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Full text of "Text Book Of Mechanical Engineering"

316

Portable Hydraulic Riveter*

diameters on the ram; c and v to obtain two powers, while w acts
simply as guide for the cupping tool F. When the smaller power is
required, water pressure is admitted to the annular area D, but if
plug E be unscrewed it acts also on the back of c, the pressure then
being due to both areas c and D. K is the valve box, containing
the piston valve Q, capable, by means of the passages within it,
of connecting the annular chambers N and M, or of opening M to
L, where the pressure-water enters. G is the returning ram, upon
which a constant pressure is exerted through pipe H, and space N
communicates with the exhaust pipe j. The handle P acts on the
valve lever o, so that if the latter be moved to the left, space M is
uncovered and pressure-water enters cylinder B ; but if o be moved
to the right, spaces N and M are connected, and the cylinder
water passes out to the exhaust pipe. The machine is slung by
chains R R from a pulley T, provided with worm gear; by turning
which from the hanging chain T, the frame may be set at various
angles to the vertical within the plane of the paper. Studs also
are fixed on the frame at the centre of gravity of the whole, on
which are placed the slinging pieces x x, and the worm gear at
s turns the frame in a plane at right angles to the previous move-
ment : universal adjustment being obtained by the combination
of the two motions. The space between the cupping tools may
be adjusted by the insertion of longer or shorter dies, or by pack-
ing collars; and the method of riveting needs , no further
description.

Taking now the lever machine at Fig. 300; A and B are the
levers, the first carrying the piston E and the second the cylinder
D, while both are connected by the pin or fulcrum c. To avoid
another joint the curved cylinder was devised by Mr. Fielding, as
well as special tools for its perfect machining: two enlarged
sections of it are shewn. The pressure pipe is coupled at j,
where a sheath attached to the union preserves the pipe from
injury by sudden bending, and the movements of the machine
are not interfered with, for the water passes through a swivel joint
at K, through the coiled pipe M and the swivel N, then through
the pin at N and the arm Q to the fulcrum pin; another swivel E
and a short pipe x connecting c with the valve-box, u is the
exhaust pipe, led away as required, and tbe piston valve H is